/ 5kCstlI; [email protected] 5kR:st-; `kRstlI/ adj (-ier, -iest) costing much; expensive 费钱的; 昂贵的: It would be too costly to repair the car. 修理这辆汽车要花很多钱. * a costly mistake, ie one involving great loss 造成重大损失的错误. > costliness n [U].